Staple driving machine



F. POLZER STAPLE DRIVING MACHINE -March 12 1935.

Filed April 9 1932 Patented Mar. 12, 1 935 UNlTED STATES STAPLE DRIVINGMACHINE Fridolin Polzer, South Norwalk, Conn., assignor to The E. H.Hotchkiss Company, Norwalk, Conn., a corporation of ConnecticutApplication April 9, 1932, Serial No. 604,193

a g 9 Claims.

This invention relates to new and useful improvements in staple drivingmachines.

An object of the invention is to provide a stapledriving plunger may beeasily released should it bind in the raceway. 1

Other objects and advantages willgbecome apparent from a considerationof thefollowing detailed description taken in connection; with theaccompanying drawing wherein is shown a satisfactory embodiment of theinvention. However, it will be understood that this disclosure is forthe purpose of making clear the principles of the invention and that theinventionis not limited to the details shown but includes all suchmodifications and variations as fall within the scope of the appendedclaims.

In the drawing: V

Fig. 1 is a side elevational View of the forward portion of a stapledriving machine in accordance with the invention; p a

Fig. 2 is afront elevational view thereof;

Fig. 3 is a vertical sectional view through the forward portion of themachine;

Fig. 4 is a similar viewof thelower forward portion of the machineshowing a staple strip in place therein; and v Fig. 5 is a detailsectional view substantially along the line 5-5 of Fig. 3.

Referring in detail to the drawing, at 6 is shown a portion of thehousing of a staple driving ma chine which machine may be either astapling machine or a tacking machine. The housing 6 may include aforward portion or head '7 and a rearwardly extending hollow portion 8forming a handle. A plunger 9 is operable in the head '7 of the machineand at its-upper end the plunger carries a head 10 while its lower orinner end is hollow as at 11 to receive a portion of a coil spring 12which coil spring'normally serves to maintain the plunger in itselevated or outermost position. This coil spring also operates to returnthe plunger to normal position when it is moved from such position inthe operation of driving a staple.

Movement of the plunger is limited as by a pin 13 supported in the head7 and disposed in a slot 14 in the plunger. Obviously, movement of theplunger is limited by engagementof either of the closed ends of the.slot 14 with the pin 13. On its forward face the plunger 9 carries asteel plate 15 forming the staple driving-part of the plunger and thisplate operates in a raceway 16 as will be understood. The lowerportion'of the housing 6 may be closed as by a staple strip guide bar 17at its inner or forward end forming one side of the raceway 16 and thisguide bar 17 is adapted to have the staple strip 18 mounted thereonandthe strip is fed forwardly along the guide bar to the raceway 16 asby a follower 19. Any spring means may beprovided for urging thefollower along the guide bar and as here shown a'coil spring 20 isconnected at one end with the follower 19 as by a screw 21 and thisspring is passed over pulleys or idlers 22 and anchored within thehandle 8.

As abovestated the inner or forward end. of the guide bar 17 forms oneside of the raceway l6 and the other side of this raceway is formed by ablock 23 having extensions 24 straddling the raceway and at their innerends pivotally connected to the housing, as to a portion of the guidebar '17, by a pin 25. It will thus be seen that while the pivotalmounting for the block 23 is located at the inner side of the raceway 16the block itself when in normal position forms the outer side of theraceway. The block in Figs. 1 through 4 is shown in full lines in itsnormal position and the block is adapted to swing on the pin 25 into theopen position in which it is shown by dot and dash'lines in Fig. 1. Ashere disclosed the block 23 carries a pivotally mounted dog or finger 26adapted to prevent a second staple of the strip 18 entering the raceway16 until the first staple to enter the raceway has been driventherefrom. This dog orifinger 26 is fully disclosed and claimed in myPatent Number 1,829,537, patented October 27, 1931.

According to the present invention, means are provided'for yieldinglysecuring the block 23 in its normal position in which position it formsone side of the raceway 26. Said means as herein disclosed includes alever 27 pivoted intermediate its ends tothe head 7 of the machine as bymeans of a pin 28 passing through the end portions of the arms of asubstantially U-shaped clip 29 secured to the lever as by the rivets 30.If desired, a recess 31 may be cut in the forward face of the head? ofthe housing, the said recess receiving the pivotally mounted endportions of the arms ofthe clip 29 whereby the lever 27 may bedisposedclose to the housing so as not to detract from the appearance of themachine.

The lever 27 is so arranged that its lower end portion 32 is adapted tooverlap the upper edge portion of the block 23 when the parts are intheir normal positions and if desired the upper edge portion of theblock may be notched as at 33 to receive the lowerend portion of thelever. The upper end portion 34 of the lever is offeset with respect tothe end portion 32 thereof and arranged between the upper end portion 34of the lever and the forward or adjacent face of the head '7 of thehousing is a coil spring 35. Thissp-rin'g has its respective endportions anchored to the lever and the housing as by entering recessesinthe lever and housing as shown. Obviously, the spring normally urges theportion 34 of the lever in a direction away from the housing with there= sult that the lower end portion 32 of the lever is pressed againstthe block 23 yieldingly securing it in its normal position.

In the normal operation of the suming a staple strip 18 to be in placeon the guide bar, the follower 19 will be operated to feed the s'tripalong thebar and dispose the foremost staple of the strip in the racewayl6. 5 The head 10 of'the plunger may now be struck'or pressed in a'direction against the action of spring -12 causing the steel plate 15 tonove' downwardly through the raceway and drive the staple therethrough.On the plunger being released the spring 12 will normally returnitto itsupper or outermost position ready for the next operation. 'If it shouldhappen that the steel plate or staple driving part 15 of the plungerbinds inthe raceway because "of lateral pressure caused'by a staplejammed in the raceway and the spring 12 is not strong enough to returnit to normal position, owing to the fact that the block--23 isyieldingly held in normal position forming one side of th'e raceway thisblock may yield mmove slightly toward open position on the lateral pressure becoming excessive and thereby prevent damage to the machine.

Should the staple driving plate or part 1-5 bind in the raceway itisobvious that it may be more easily released when the "side of theraceway yields laterally than would be the case if the side of theraceway were rigid and immovable with'respec't to the housing. Of'eourse, the pressure exerted on the block 23 by the le'verf27 must beconsiderably greater than the normal lateral pressure due'to the feeding'of the "staple strip by the follower I9 and the lateral pressuredeveloped in the normal or ordinary operation of driving a staplethrough "the raceway. However, when the lateral pressure is sufiicientto bind the plunger the pivoted block 23 will-yield without binding theplunger in such 'a manneras to injure the mechanism and the plunger willnot be held so tightly but that it is easily released.

I Additionally, if the pressure of the lever 27 on the block 23 isrelieved somewhat as by pressing the upper end portion 34 of the leverinwardly with the hand against the actionof the spring Bdtheplunger willberelease'd and moved back to normal positionby the plunger spring 12,In machines wherein the sides of the raceway are rigidshoulda'staplewedge in the raceway then somepart of' the machine would lik'elybe'broken under theforceof the blow whenthe plungerhad beendriven"down'wardly as by amallet. "Orthe plunger and the 'staple wouldbe" so tightly 'J'ammed in'the raceway-that "it wouid e difiicult tofree them. with'thepresentdevicethe block machine, "as- .rp s.

23 or the front of the raceway yields and no damthe raceway and when thestaple has been forced out the block is immediately returned tonormalposition. Should the lateral pressure be very great the blockwillibe forced out sufficientlyto pass from under the lower portion ofthe lever and move to wide open position as shown by the dot anddashlines in Fig. 1., I v

The staple driving machine of the present invention may be loaded fromthe front by pressing inwardly on the upper portion of the lever 27 soasto shift the lever to the position in which it isshown by dot and dashlines infFig. 1. This will permitthe block 23 to be swung to' openposition exposing the forward end of the staple strip guide bar 17 overwhich the new staple strip may be 'passe'd as will be understood; "On

the new staple-strip'being placed in position the block or gate '23 maybe returned to normal" po siti'on -an'd secured by the lever 27. Havingthus set forth thenature 'ofmy -inven-' tion, what I claim-is: -1. In astaple driving machine, a housing having a raceway therein, means forfeeding staples to said raceway, a plunger operable to drive sta-' plesthrough said raceway, a block pivoted to said;

housingnormally forming one side of said race way and adapted to movelaterally therefrom means yieldi'n'gly tending to turn the'block on itspivot to secure said block in normal position;

and manually manipulatable 'rneans for shifting said block se'eu'ringmeans to relieve the pressurewithwhich it engages the block;

2. In astaple'drivi-ng machine, a housing -having araceway therein,-fnea'nsfor feeding staples to said raceway, a plunger operable to drivesta pies through said raceway, a block including "an.

extension pivoted to the lower portion of the housing atone side of theraceway; said bloek:

having a normn 'po'sition forming -the o posite side of saidraceway-and*extending abovesaid extension, and means engagingsaid'blockabove said 'p'ivoted extension and 'yielding'ly securing saidblock 111 normal position 3. In a staple drivingmachihega housing hav aing a raceway therein; 'means for feeding staples to said raceway,Ineansfoperable-to drive'staples through said raceway,-a *block' pivotedfto' 'sa'id housing and when in normal position forming one side of saidraceway, a spring pressed'lever pivoted to said housing, and said leverengaging Said block and y-i'eldiiigly retaining it in normal position. vV j j 4. In' a staple driving machinefa housinghav inga racewaythereinjme'an's for-feeding staples to said raceway; means operable todrivestalples through said racewayya block-pivoted to-sfaid I housingand when in normal fDos'ition'fo'r'mingfone side of "said' raceway, 'alever'pivoted intermediate its ends to said-housing; and "a sp ng meansnormally urging one end portion of the lever .in a

direction away from the housing "and the" other end portion of the leveragainst said block where'- by the blockis yieldingly held in normalposition.

5. In a staple driving machine, ahlousin'ghaiva aewawe a for ed eri s tosaid raceway, rne'ans operable "todrive' staples through Said racew'ay,ablock pivoted tb ezild housing and when in normal position rz'ir'mihgone side of saidraceway, a lever pivoted to 'said housing, a sprmg meansndrmauy urgmg cne end portion of said lever in a direction away fromsaid housing, said spring means urging the other end portion of thelever against said block whereby the block is yieldingly held in normalposition, and said lever adapted to be moved about its pivot against theaction of said spring means to permit said block to swing to an openposition.

6. In a staple driving machine, a housing having a raceway therein,means for feeding staples to said raceway, means operable to drivestaples through said raceway, a block pivoted at its lower end to saidhousing and when in normal position forming one side of said raceway, aspring pressed lever pivoted to said housing, and said lever including aportion engaging the upper portion of said block and yieldinglyretaining it in normal position.

7. In a staple driving machine, a housing having a raceway therein,means for feeding staples to said raceway, means operable to drivestaples through said raceway, a block hingedly connected at its lowerend to said housing and when in normal position forming one side of saidraceway, a lever pivoted intermediate its ends to said housing, and aspring means normally urging one end portion of the lever in a directionaway from the housing and the other end portion of the lever againstsaid block whereby the block is yieldingly held in normal position.

8. In a staple driving machine, a housing having a raceway therein,means for feeding staples to said raceway, means operable to drivestaples through said raceway, a block hingedly connected at its lowerend to said housing and when in normal position forming one side of saidraceway, a lever pivoted to said housing, a spring means normally urgingone end portion of said lever in a direction away from the housing,'said spring means urging the other end portion of the lever against saidblock whereby the block is yieldingly held in normal position, and saidlever adapted to be moved about its pivot against the action of saidspring means to permit said block to swing to an open position.

9. In a staple driving machine, a housing having a raceway therein,means for feeding staples to said raceway, means operable to drivestaples through said raceway, a block including an extension pivoted tothe lower portion of the housing at one side of a raceway, said blockhaving a normal position forming the other side of said raceway, aspring pressed lever pivoted to said housing, and said lever including aportion engaging said block and yieldingly retaining it in normalposition.

FRIDOLIN POLZER.

